Update README.md

Author: simongravelle

README.md

@@ -18,13 +18,13 @@ Finally,
 
 <p float="left">
     <a href="https://lammpstutorials.github.io/sphinx/build/html/tutorials/level1/lennard-jones-fluid.html">
-        <img src="https://raw.githubusercontent.com/lammpstutorials/lammpstutorials.github.io/version2.0/docs/avatars/level1/lennard-jones-fluid/avatar-Lennard-Jones-LAMMPS.png" width="32%" />
+        <img src="https://raw.githubusercontent.com/lammpstutorials/lammpstutorials.github.io/2Aug2023/docs/avatars/level1/lennard-jones-fluid/avatar-Lennard-Jones-LAMMPS.png" width="32%" />
     </a>
     <a href="https://lammpstutorials.github.io/sphinx/build/html/tutorials/level1/breaking-a-carbon-nanotube.html">
-        <img src="https://raw.githubusercontent.com/lammpstutorials/lammpstutorials.github.io/version2.0/docs/avatars/level1/breaking-a-carbon-nanotube/CNT.png" width="32%" />
+        <img src="https://raw.githubusercontent.com/lammpstutorials/lammpstutorials.github.io/2Aug2023/docs/avatars/level1/breaking-a-carbon-nanotube/CNT.png" width="32%" />
     </a>
     <a href="https://lammpstutorials.github.io/sphinx/build/html/tutorials/level3/water-adsorption-in-silica.html">
-        <img src="https://raw.githubusercontent.com/lammpstutorials/lammpstutorials.github.io/version2.0/docs/avatars/level3/water-adsorption-in-silica/water-adsorption.png" width="32%" />
+        <img src="https://raw.githubusercontent.com/lammpstutorials/lammpstutorials.github.io/2Aug2023/docs/avatars/level3/water-adsorption-in-silica/water-adsorption.png" width="32%" />
     </a>
 </p>